Apparatus for firing furnaces with powdered fuel



Oct. 23, 1923-. 1,471,681 J. J. C. BRAND APPARATUS FOR FIRING FURNACES WITH POWDERED FUEL Original Filed March 7. 1919 .Z/ E

Patented Oct. 23, 1923.

UITED STATES PATENT OFFICE.

JAMES JOHN CANILEY BRAND, OF SYDNEY, NEW SOUTH WALES, AUSTRALIA.

APPARATUS FOR FIRING FURNACES WITH POWDERED FUEL.

Original application filed March 7, 1919, Serial No. 281,189. Divided and an; application filed July 11,

1921. Serial No. 483,910.

To all whom it may concern:

Be it known that I, JAMns JOHN CANTLEY BRAND, subject of the'King of Great Britain and Ireland, residin at Garden Island, Sydney, New South Wa es, Australia, have invented new and useful Improvements in Apparatus for Firing Furnaces with Powdered Fuel, of which the following is a-specificatiqn.

This invention relates to an improved burner to facilitate complete combustion of powdered fuel in boilers, and constitutes a division of m former application Serial No. 281,189, filed arch 7, 1919.

In the accompanying drawings Fig. 1 is a vertical section through a noz zle and hot box;

Fig. 2 is a horizontal part section on the line 2-2 Fig. 1; 20 Figi 3 is a sectional elevation on the line The fire door end of the furnace flue is extended forwardly at a greater or less distance for the purpose of shielding the flue plates of the boiler from injuriously excessive temperatures. The fire doors 1 are mounted in the extension end plate 2 andbehind said plate an airchamber 3 is contained forwardly of the fire brick dia- 'phragm 4. The burner nozzle 5 is outwardly flared and fitted internally with a mouth cone 6 which 0 erates to spread the blast as a conical annu us. It is water jacketed as shown'at 7 and fitted with a tubular collar 8, having vents 9 cut around it placing the annular air collar space 10 in connection with the chamber 3 which is connected through a pipe 11 with an air blast pipe (not shown). The air blast into this chamber is preferably heated. The collar.

vents 9 are formed tangentially as shown in Fig. 2 for the purpose of applying whirling motion to the air passing from the chamber 3 through them into the collar space 10 surrounding annular mouth 12 of the nozzle. The nozzle is withdrawable without disturbingits relation to the conical collar 8 when the fire doors 1 are opened. To facilitate its withdrawal, the nozzle is mounted slip joint 18.

I 60 on the end of a furnace feed pipe 20 by a In the end of the pipe 20 a hlical vane 14 is fitted to produce a whirling motion of the fuel as it enters the furnace. The direction of the rotation of the fuel blast and of the air blast in the collar correspond. Within the furnace'flue 15 directly in front of the nozzle a checker work firerbrick hot box 16 is constructed. Initial combustion takes place in this box which becomes incandescent and the flaming gases therefrom pass through the checker vents into the furnace flue 15 and thence through the tube system of the boiler passin out as usual through the smoke box 17 to t e up-take (not shown).

18 and 19 are inlet and outlet connections of the water jacket 7. They are connected and supplying pressure air thereto, said 001- lar having apertures leading from the air blast box to the interior of the collar and a fire brick hot box constructed ofopen-work fire brick located in front of the burner nozzle.

2. A burner for the purpose described comprising a fuel supply pipe, a water jack-' eted flaringnozzle detachably connected to said pipe, a collar surrounding said nozzle, an air last box inclosing said collar, said collar being spaced from said nozzle and having apertures therein leading from the air blast box to the interior of the collar, an open-work fire brick hot box in alinement with said nozzle, and means in the nozzle supply pipe and in the collar surrounding said nozzle to produce whirling motion in the fuel supply and in the collar air supply, respectivel v In testimony whereof I aflix my signature.

JAMES JOHN CAN TLEY BRAND. 

